Why are guys like this? It makes me so sad .....?

I guess basically, that is my question. All the guys at my school are completely obssessed with sex. Im not even joking! They all watch porn, masturbate (they freaking brag about this at school), and are just completely obssessed. The guys are 14, 15, and 16, if it makes any difference. They dont like any girls who dont wear revealing clothes, have huge boobs, or who dont want to have sex. Why is this? The future kinda looks bleak to me....